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Semesta Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 1411061X     EISSN : 25025481     DOI : https://doi.org/10.18196/st
Core Subject : Engineering,
Engineering
SEMESTA TEKNIKA is a reputable refereed journal devoted to the publication and dissemination of basic and applied research in engineering. SEMESTA TEKNIKA is a forum for publishing high quality papers and references in engineering science and technology. The Journal is published by the Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, INDONESIA. Copyright is by the publisher and the authors. The Journal is issued in electronic form and also issued in printed form as annual volume for the contributors only. The journal contains original research papers, review articles, short notes and letters to the editors. The topics of interest include modeling, experimental, analytical and numerical investigations on the mechanical, physical, chemical and mineralogical properties of material, developing the prototype/instrument, technology and construction process. Topic of management in industry and civil construction is also considered. SEMESTA TEKNIKA receives manuscripts from the contributor written in the Indonesian and English. Manuscripts submitted to the journal for publication must not have been previously published or is under consideration simultaneously by any other publication. Manuscripts submitted to SEMESTA TEKNIKA will be reviewed Peer Reviewers local and foreign.
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Articles 715 Documents
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Model Power Sistem Stabilizer Berbasis Standar IEEE untuk Stabilitas Transien Sistem Tenaga Listrik Jamal, Agus
Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v13i1.729

Abstract

Power System Stabilizers (PSS) are added to excitation systems, in order to enhance the damping of electric power system during low frequency oscillations. For large scale power systems comprising of many interconnected machines, the PSS parameter tuning is a complex exercise due to the presence of several poorly damped modes of oscillation. The problem is further being complicated by continuous variation in power system operating conditions. In the simultaneous tuning approach, exhaustive computational tools are required to obtain optim um parameter settings for the PSS, while in the case of sequential tuning, although the computational load is fewer, evaluating the tuning sequence is an additional requirement. There is a further problem of eigenvalue drift. This research proposes the PSS model based on IEEE Standard 421.5 PSS 4B for designing robust power system stabilizers for a multi machine system. Simulations were carried out using several fault tests at transmission line on a Two-Area Multimachine Power System. As a reference the PSS model, Delta w PSS and Delta Pa PSS has been used for comparison with the PSS under consideration. The result shows that power transfer response using the model is more robust than Delta w PSS and Delta Pa PSS, especially for three phase faults and phase to ground faults.
Pengaruh Pemodelan Elemen Tangga pada Gedung Beton Bertulang terhadap Beban Gempa: Studi Kasus Gedung Hotel Tajem Paradise City Yogyakarta 5 Lantai Harsoyo, Yoga Aprianto
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2353

Abstract

Indonesia is a country that has a high seismic risk, so that the high-level buildings need to be designed to resist earthquake loads. Modeling of buildings generally use three-dimensional program. The designers usually model beams and columns as elements of the line and the rest, which were slab, shear wall and stairs modeled as two-dimensional elements or shell elements. Modelling stairs using shell elements can rigidify building. When structural elements in buildings are designed based on these conditions, it will be more vulnerable under seismic load. In this paper, it will be examined on effect of stair in buildings under earthquake load. The parameters that will be studied are building’s natural period, displacement between floors, and seismic forces that occur in the building. From this research, it is known that modeling without stairs will create a larger building’s natural period and displacement between floor so that modeling without stairs will make more conservative design structures against earthquake loads.
Analisis Campuran Bahan Bakar Bensin Dengan Minyak Tanah Pada Pompa Air Agar Biaya Murah Yusron, Zaenal
Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i2.842

Abstract

Mesin pompa air atau didesa sering disebut dengan diesel, sangat vital untuk petani desa yang pengairannya tergantung pada hujan. Pompa air yang digunakan merupakan pompa air yang memakai bahan bakar bensin namun seringkali didesa diganti dengan bahan bakar minyak tanah. Bensin yang beredar dimasyarakat memiliki angka oktana 88 RON dengan harga per liter Rp. 4.500,00 Sedangkan minyak tanah memiliki spesifikasi titik asap minimum 16 mm. Dengan harga Rp. 2.750,00. Bensin yang diuji sebagai sampel dibeli di POM yang resmi, sedang minyak tanah dibeli di pengecer, dengan asumsi bahwa kualitas bahan bakar yang dibeli sama dengan kualitas yang diproduksi Pertamina. Teknik analisis dengan membuat data dalam bentuk grafik untuk dilihat sejauh mana perbedaan antara campuran bensin premium dan bahan bakar minyak tanah terhadap jumlah volume air yang dihasilkan dan tingkat biaya bahan bakar yang dihabiskan. Parameter yang dipakai untuk menyatakan bahwa beaya operasinal murah adalah jumlah air yang dihasilkan dengan harga bahan baker termurah. Dengan 11 campuran (dari 0 % sampai 100%) maka  akan tampak dimana yang paling efisien. Berdasarkan analisis data yang dilakukan bahwa Waktu yang digunakan untuk mengairi sawah, tercepat : menggunakan bensin murni (campuran 0%) : 10.15 jam. Terlama : menggunakan minyak tanah murni, yakni 13.15 jam, selisih antara keduanya adalah 3 jam. Bahan bakar yang digunakan; Bahan bakar teririt : menggunakan bensin murni : 6,86 liter. Bahan bakar terbanyak  menggunakan minyak tanah murni : 8.15 liter. Selisih antara keduanya 1,29 liter. Sedangkan beaya yang digunakan,adalah beaya paling irit : menggunakan minyak tanah murni Rp. 22.408,-. Beaya paling mahal : menggunakan bensin murni : Rp. 30.871,-. Selisih antara keduanya : Rp. 8.506,-
Strategi Penawaran dalam Industri Konstruksi (Studi Kasus di Layanan Pengadaan Secara Elektronik, Kota Bandung) Hakas Prayuda, Mandiyo Priyo ,
Semesta Teknika Vol 16, No 1 (2013): MEI 2013
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v16i1.430

Abstract

The aims of this research are to calculate the value of mark-up using bidding strategy approach and to determine the best bidding strategy to win a tender with the optimum mark-up value and the optimum profit. The data being used in this research are auction data that have been completed in 2010-2012 at LPSE Bandung using statistical approach namely discrete multi distribution, normal multi distribution, and single normal distribution. Bidding strategy methods being used are Friedman Method, Gates Method, and Ackoff Sasieni Method. The Friedman Method can generate an optimum mark-up of 10% with expected profit of -0.0014, an optimum mark-up of -9% with expected profit of -0.0003, and an optimum mark-up of -1%  with expected profit -0.0004 for discrete multi-distribution, multi-normal distribution, and  single normal distribution, respectively. The Gates Methods can produce an optimum mark up of 6% with expected profit of 1,5000, an optimum mark up of 5% with expected profit 0.0097, and an optimum mark up of 6% with expected profit 1.2888 for discrete multi distribution, multi-normal distribution, and single normal distribution, respectively. While the Ackoff Sasieni Methods can generates an optimum mark-up of -2%  with expected profit -0.0003, an optimum mark-up of  1% with expected profit for 0,0013 for discrete multi distribution, and for both multi and single normal distributions, respectively.
Perancangan Dan Pembuatan Aplikasi Decision Support System Pada Departemen Hrd Dan Pembelian Dengan Menggunakan Metode Analytical Hierarcy Process (AHP) Setiawan, Alexander; Irawan, Muhammad Isa; Wijaya, Robin
Semesta Teknika Vol 10, No 1 (2007): MEI 2007
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v10i1.858

Abstract

The rapidly technology process on globalisasion era in business world, makes the decision making is the important thing to make decision faced with the competition in business world. The decision making can be influence by a few aspect and group, which can influence the decision maker to accelerate the fast, perfectly and correctly the decision making. This software created by using Analytical hierarcy process method is doing calculation proses to get the best decision, using the score group of calculation and compare it with each possibility count of the choosen decision, this software specially for HRD and purchasing division, for HRD division this software will be use to decide which employee will be promoted or which employee will be fired. For purchasing division, this software will used to decude which supplier will be choose to buy a kind of goods. Employee mark, disipline mark, and  development ability  are the group that used for HRD division, while purchasing division use quality of goods, price, accuracy time shipping and supplier identity.Application the design and the testing of decision support system result a correct and flexsibel decision with all criteria which influence that decision and give a report in order to user can understand why this software choose that decision.      
Penghitungan Tebal Setara Metode Boussinesq-Exel dan FWD-ELMOD pada Perkerasan Lentur Hardwiyono, Sentot
Semesta Teknika Vol 15, No 1 (2012): MEI 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i1.446

Abstract

Calculating the Flexible Pavement System (FPS) response has initiated by Boussinesq, Burmister, Huang and more scientists around the world. Determining modulus elasticity each stratum FPS very important to note to designing the Flexible Pavement. The purpose of this study is to determine the elastic modulus of each layer in the profile Flexible Pavement Systems (FPS) with a thickness equivalent method Boussinesq-Exel and FWD-ELMOD. Tests were run on the Soekarno-Hatta Cikampek-Purwakarta-Bandung and West Java highways, Indonesia. The test results showed a good correlation between the modulus of each layer in the FWD testing with those of Boussinesq-Exel test.
Pengaruh Konsentrasi Etanol Terhadap Unjuk Kerja Dan Emisi Gas Buang Motor Bensin Pada Kondisi Idle Dan Dengan Standar Ece 83-04 Prawoto, Prawoto; Nugroho, Bagus Anang
Semesta Teknika Vol 9, No 1 (2006): MEI 2006
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v9i1.889

Abstract

This paper describes a study an influence of ethanol concentration in premium-ethanol fuel blends on vehicle performance and exhaust gas emissions. The study is based on the vehicle test on chassis dynamometer. Exhaust gas emission was measured on idle condition and using ECE standard regulation No. 83-04. Three compositions were performed on the first step, which are 3%, 10% and 20% of volume. Performance and emission results were compared to the test results on the same vehicle fuelled with 100% premium and pertamax. The test results have shown that increasing concentration of ethanol will increase torque and power, reduce CO and HC emission, except on idle condition. 10% ethanol concentration have identical performance characteristic with the same vehicle fuelled with pertamax, with 60% less CO emission on idle condition and 30% less when using ECE 83-04 standard.
Pengaruh Diameter Elemen Bara Api Terhadap Peningkatan Efisiensi Kompor LPG Fadelan, Fadelan; Sudarno, Sudarno
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v20i2.3297

Abstract

 The addition of embers is an effort to improve the efficiency of LPG stoves. Fire-embossed element of woven pattern is made of wire nikelin. The device when is burned with LPG cooker fire will incite to form a high-temperature fire, so as to burn the unperfectly burned fuel vapor around the wire. Previous research has shown that the element of fire can improve the efficiency of 8.32%. The efficiency test is done by boiling water test. The diameter of the embers element is varied, 20 mm, 30 mm, and 40 mm. The performance of the appliance is compared to the LPG stove without the use of embers. Temperature distribution at each treatment was also examined. It was found that the use of fire element with diameter of 0.20 mm resulted in the highest efficiency of 61.71%, with an increase of 8.32%. Temperature distribution test results show that the use of fire diameter element 0.20 mm produce the most optimal adult fire areas.
Risiko Kestabilan Lereng Akibat Gempabumi (Studi Area di Kecamatan Patuk, Kabupaten Gunungkidul) Hari Suryana, Eka Priangga; Pramumidjojo, Subagyo; Satryarno, Iman
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211215

Abstract

The research about risk of slope stability as an effort to mitigate landslide slopes due to the earthquake, based on the earthquake of Jogja 2006 along the Opak River fault. The methods used in this study refers to the PERKA BNPB number 2 of 2012, which conducts a qualitative assessment of the landslide control parameters. Slope stability test is done as an effort to see the effect from earthquake to slope using SLOPE / W software. Test results at 3 locations, each slope in a stable state under normal conditions without earthquake. The first slope (1) in Patuk village has a value ofsafety factor is 2.45, while in earthquake condition has safety factor number is 1.27. The value of the safety factor on the second slope (2) in Ngoro-oro village under normal condition safety factor is 2.22 and the earthquake condition has value safety factor is 0.74. The third slope (3) in Ngoro-oro village has a safety factor number is 3.62 while in earthquake condition has value 1.95. The result of landslide risk calculation use first (1) scenario in Patuk sub-district generally has medium class, with yellow color in landslide risk map. Patuk villages has high class level for landslide risk map, meanwhile Terbah and Semoyo villages have low level class for landslide risk map. The slope in Patuk sub-district has stable conditions againts earthquake, but the change from slope material caused by weathering can made trigger landslide in future.
Analisis Tarikan dan Bangkitan Perjalanan Akibat Pembangunan Mix-Used Plan (Mix-used JogjaOne Park) dengan Metode Pembanding Muchlisin, Muchlisin
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2370

Abstract

Developing an hotel, apartment, condotel, housing, malls and plazas often happens in various corners of the Yogyakarta region. This fact is also triggered increasingly high demand for housing in the city (city living) which is adjacent to the location of work, study or daily activities or in this case is a mix-used planning called Mix-Used JogjaOne Park (JOP). This study aims to determine the magnitude of the impact of traffic on the trip generation and attraction caused Mix-Used JogjaOne Park (JOP) either on the existing condition or when operational in 2020 and 2025. The method used to predict the method of traffic generation using a comparison against similar activities. For comparative exercise activity, is used as a comparison Ambarukmo Plaza mall and shopping activities. While Mataram City as a comparison of activities and hotel apartments. Indonesian Highway Capacity Manual 1997 is used to determine the performance analysis of the road network. From the analysis conducted, the performance conditions on Jalan Adi Sucipto still at LOS D (DS 0.9) on the existing conditions, while at operaisonal at LOS E (DS 1). The condition is not signalized intersection Babarsari - Jl. Adi Sucipto at LOS B (average delay of 5.1 to 15 sec / veh) on condition eksiting, while the LOS still operational at the signalized intersection LOS B. In the East Ringroad - Jl. Adi Sucipto at LOS F (delay (sec / veh) 60) on condition eksting, while also operating at LOS F. And at three signalized intersections Janti Fly Over at LOS D (delay average is 25.1 to 40 seconds / veh) on condition eksting, whereas when operating at LOS E ((delay average is 40.1 to 60 sec / veh).

Page 57 of 72 | Total Record : 715

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